In a way, they have. They redefined all their common measurements in terms of the metric standard, and in science and engineering, they do use the metric system. It does seem weird though, and I agree with you there, that it just cannot seem to break into the school system, or everyday life. Then again, they also write their dates in a weird way.
Perhaps the thing I like to make fun of the most, is how everything is becoming a “truck” over there. So the term “truck” has its origin in mining, as does the British word “lorry”. Initially, as the shift came about from mining cars on rails to load-carrying road vehicles, a truck and a lorry were two terms for the same thing: A freight carrying vehicle. Then came the shift: Probably because their “bakkies” are as large as lorries, they call all pick-ups a “truck”.
Then, because some SUVs are as large as the pickup it is based on, those are often also called a truck. A Cadilac Escalade, is a truck.
Then came the shift to smaller pickups, such as a Honda Ridgeline or a Ford Maverick, but of course, the pattern is established now, so these are all trucks too.
Meanwhile, actual trucks needed a new name, so they are now called semis. A word that literally means “half” 
Then comes the insanity over other motoring terms. The liquid these things run on, is called “gas”. The front of the car is the hood, the back is the trunk. OK, I am down with that, but then they decided that if the baggage space is in the front, they will call it a frunk. What in the name of all that is holy is this abomination? It isn’t even fun to say it, I feel like a kid with a speech impediment.
Up North, in SA, I see some Isuzu owners referring to their steed as a “trokkie”. Come on people, do we really have to copy this insanity!?
But… jokes aside There is one cool thing about the NACS system: They use a temperature sensor on the cable. Instead of limiting you to some safe value for the amount of copper in that cable, they happily exceed the cable rating in the name of charging speed, and if things run hot they slow down. That’s why the Tesla chargers pretty much all charge at 117kW, but if you’re a CCS2 guy, you often have to hop around between chargers hoping to get a good one that charges full speed. I’ve had some experience with that earlier this month, moving the Polestar 2 I rented between stations until I got one that could match the car’s 150kW charge capacity.
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